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Computer says misfire #3, i replaced #3coil,plug and wire we're thinking val job
1999 Pontiac Grand Am

Computer says misfire #3, i replaced #3coil,plug and wire we're thinking val job

(1999 Pontiac Grand Am)
missing badly i've replace serval things nothing helped, how do i find the values in this motor,have replaced heads 3 times ,intake manifold gaskets 2 times, timing chain and gears with gaskets, water pump,drive belts and pulleys, hoses and water resiovor and i still lose water what else can that be
1 answer & 2 comments
Popular Answer
Check the compression, look for a vacuum leak at the intake manifold and "listen" to the fuel injector to see if it is firing. Using a mechanic's stethoscope (or use a long screw driver placing the handle end up to your ear place the metal tip end of the screwdriver against the body of the fuel injector), get a friend to crank over the engine while you "listen" to the fuel injector listen to each injector at the same point of the injector body. You should hear "click, click, click" as the injector is electrically opened and closed by the computer. If the injector is not being triggered you will not have fuel getting into the engine's cylinders.
The coolant loss, were the cylinder heads pressure tested to see if they were cracked or porous.
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on November 26, 2011
yes sir they were redone the last time said no cracks or anything wrong been less then a year.i will do the testing hopefully tom. thank u
on February 15, 2012
IM HAVING THAT SAME PROBLEM WITH MY CAR!!!! DID U EVER GET THAT FIXED AND IF SO WHAT DID U DO????
General Diagnosis
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Check the compression, look for a vacuum leak at the intake manifold and "listen" to the fuel injector to see if it is firing. Using a mechanic's stethoscope (or use a long screw driver placing the handle end up to your ear place the metal tip end of the screwdriver against the body of the fuel injector), get a friend to crank over the engine while you "listen" to the fuel injector listen to each injector at the same point of the injector body. You should hear "click, click, click" as the injector is electrically opened and closed by the computer. If the injector is not being triggered you will not have fuel getting into the engine's cylinders.
The coolant loss, were the cylinder heads pressure tested to see if they were cracked or porous.
Sign in to reply
on November 26, 2011
yes sir they were redone the last time said no cracks or anything wrong been less then a year.i will do the testing hopefully tom. thank u
on February 15, 2012
IM HAVING THAT SAME PROBLEM WITH MY CAR!!!! DID U EVER GET THAT FIXED AND IF SO WHAT DID U DO????

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